Water purification unit



FIG. 1 is a perspective view of my design for a water purification unit;

FIG. 2 is a front view thereof;

FIG. 3 is a back view of the system;

FIG. 4 is a side view, the opposite side being a mirror image thereof;

FIG. 5 is a bottom view thereof; and,

FIG. 6 is a top view of the inventive design. 

The ornamental design for a water purification unit, as shown and described. 